*{
    margin: 0;
    padding: 0;
}

html, body{
    height: 100%;
}

body{
    width: 100%;
}
/* style */
em{
    font-style: normal;
}

a{
    text-decoration: none;
    outline: none;
}

p{
    user-select: none;
}

img{
    user-select: none;
    -webkit-user-drag: none;
}

/* float */
.fl{
    float: left;
}

.fr{
    float: right;
}

.clearfix::after{
    contain: "";
    display: block;
    clear: both;
}